Mesoscale Discussion 2318 NWS Storm Prediction Center Norman OK 0732 AM CST Sun Dec 29 2024 Areas affected...the Lower Savannah Valley to southern NC Concerning...Tornado Watch 724... Valid 291332Z - 291500Z The severe weather threat for Tornado Watch 724 continues. SUMMARY...A few brief tornadoes and sporadic strong gusts should remain possible through midday with an extensive narrow QLCS. A downstream WW issuance is possible by late morning. DISCUSSION...Forward motion of a long-lived QLCS has remained steadily eastward at 40-45 kts. Despite rather strong low-level flow, measured surface gusts have consistently peaked at around 40 kts across multiple sites in SC/GA (GMU, GSP, and AGS) during the past hour. The lack of stronger gusts is in part due to the scant instability and weak tropospheric lapse rates. Downstream 12Z soundings at CHS, MHX, and GSO sampled negligible buoyancy, suggesting that appreciable intensification is unlikely. Still, with 0-1 km shear of 40-50 kts per the CAE VWP, transient mesovortices will remain possible, yielding brief tornado potential. These may tend to be more focused from the Lower Savannah Valley across SC where mid 60s surface dew points are sustained. ..Grams.. 12/29/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...RAH...ILM...CHS...CAE...GSP... LAT...LON 34668143 35228167 35538110 35608031 35317969 34867917 34217870 33887875 33117903 32487996 31938071 31678123 31998198 33368144 34668143
2024-12-29 13:35:03
